For about two hours on Monday morning, trading in shares of about 40 stocks on the New York Stock Exchange was halted after a technical glitch led to misquoted prices, including those of Berkshire Hathaway, which showed a drop of more than 99%.
The exchanges use built-in “circuit breakers” to automatically pause trading when a stock price suddenly swings by a large amount. The exchanges also have rules that allow traders to flag erroneous trades and seek compensation if necessary.
https://www.nytimes.com/2024/06/03/business/nyse-trading-glitch-berkshire-hathaway.html